It is under-building not underground parking since the parking is really the ground floor. It runs throughout the building. There are actually some spots just outside and not under the building but they are just part of the same parking system. There are two wings of rooms, north and south, with south the one that runs closer to Jambo. There are three elevators on each wing, one near the lobby and then two spread down the wing. The result is that no matter where your room is you can park fairly close to it.
We always get savanna view and the first time I went I made no request and was given a room right near the end of the north wing. Since then I have always requested a room close to lobby or close to community hall (the two are essentially the same requests) and have gotten that request every time (five now since the first Kidani reservation). Close to busses would be a similar request but that could leave you a little further from the lobby. What you want to avoid is where we were the first time at Kidani, the end of the north wing. There is literally no longer walk down an internal hallway to the lobby in any other hotel in the universe. We were fairly close to our car because of the elevator system. However, the walk to the lobby is so long that once when I needed to get something quick at the store, I took the car because the walk back and forth would have been forever. Think about being at the base of the World of Nations after you have crossed the main bridge from Future World leaving you between the two stores at the bottom of the World of Nations; now remember how long it is to walk to Germany from there. That is about the distance from lobby at Kidani to end rooms on the north wing.